Water-tube boiler.



M. W. SEWALL & D. S. JAGOBUS.

WATER TUBE BOILER.

APPLIGATION FILED 113.7, 1910.

2 SHEETS-SHEET 1.

INVENTORS M w. Sla/LL @M S-w www MM' ATTORNEYS.

Patented J an. 31, 1911.

. W. SEWALL & D. S. JACOBUS.

WATER TUBE BOILBR.

APPLICATION FILED P2B. v, 1910.

Patented Jan. 31, 1911.

2 SHEETS-SHEET 2'.

INVENTORS M ATTORNEY S.

narran singes earner erste MINOTT W. SEWALL, 0F 4NEW'.YORIQ N. Y., AND DAVID S. JACOBUS, OF JERSEY CITY,

NEW JERSEY, ASSIGNORS T0 THE BABCOCK & WILCOX COMPANY, OE NEW YORK,

N. Y., A CORPORATION 0F NEW JERSEY.

WATER-TUBE BOILER.

Speccaton of Letters Eatent. i

Application filed February 7, 1910. Serial No. 542,417.

To all 'whom t may concern:

Be it known that we, Minotrr W. SnwALL and DAVID S. JAooBUs, citizens ofthe United States, the former a resident of New York city, borough of Manhattan, in the county of New York and State 'of New York, and the latter of Jersey. City, county of Hudson, and State of New Jersey, have invented certain new and useful Improvements in lWater-Tube Boilers, ofwhich the following is a specification.

in our application Serial N o. 47 7 ,410, iiled February l1, 1909, for ers, boiler construction so set that the gases, before coming into Contact to a substantial extent with the water tubes, are carried below the second pass toward the rear of the boiler and thence back to the first pass before en tering upon. the course that they have heretofore takenv through the bank of tubes. With such construction -we can with highly volatile grades of bituminous coal hold the Haine substantially 'back `from the first pass and still maintain the accustomed steaming capacity and eciency of the boiler substantially without smoking and the nuisance incident thereto.

Our object is to still further improve the conditions for boiler eliiciency set forth in our said application and to that end we have selected one of the forms therein described to which the presentinvention is more particularly adapted; namely, that form in which the furnace roof consists of a row of water tubes extending from the front to the rear wall of the furnace, and by burying said tubes throughout their length obviate all exposure of the gases to a cooling surface in their passage from the fuel chamber to the first pass.

Our invention will be understood by reference to the accompanying drawings in which Figure l is a vertical longitudinal section through the boiler; Fig. 2 a vertical section on thel plane of the line 2-2 of Fig. 1; Fig.

a section onthe plane of the line 3-3 of Fig. l; Fig. 4 asection on the .plane of the line 4--4 of Fig. l; Fig. 5 a detail section showing the form of brick used in the furnace roof, and Fig. 6 a modification of Fig. 3.

water tube boil we have described a standard form of` Similar reference numerals indicate similar parts in the several views.

As explained in our application Serial N o.

477,410, A, B and C are the three transverse passes'which have proved to impart the conditions' for satisfactory steam-producing and efficiency of the standard water` tube boiler herein illustrated, the gases passing first upward through A, then downward through B, then upward through C to the uptake. The grate l, which may be hand or automatically stoked, is located substantially beneath the first pass A', but the gases, before reaching said pass, are compelled to travel through passages backward beneath the pass B, and thence forward again beneath the pass B to-pass A. In the drawing we have shown a backward travel equal to the full width of the pass B, butin some cases a less distance may be sulficient.

The structure that we interpose between the fuel chamber and the inclined bank of tubes of standard construction consists of a fire brick roof or baffle 2 extending from the front Wall 3 of the furnace rearwardly to a point beyond the bridge wall, and another baiiie 4 extending forwardly from the downtake header 5 and approximately parallel with the baffle 2 to the foot of the baile (i by which the first pass A is separated from the second pass B. Baflie 2 with the parts below it produce the passage or combustion cha-1nber Y leading from the fuel chamber through the contracted opening between said bathe and the bridge wall 7 to a point underneath the pass C, and a passage Z between bafiies 2 and 4 leads from thence back to t-he pass A. The bafiie 4 is shown as supported on the lower row of tubes 4 of the usual bank of inclined tubes so that Contact of the gases with said lower row of tubes is prevented until they reach the first pass A. The gases are also removed from contact with the water tubes' below by burying the row of roof tubes 8 in the bafHe 2, said tubes being connected with the boiler circulation through the boxes 8. In our prior application the lower ends of the tubes 8 are uuprotected and to obviate the exposure of the gases as they pass from the passage Y to the passage Z and to 'completely protect the gases from the cooling effects ofthe heating surface, we have, in the present construction the baille 2 we use the i for the purpose of retaining the tile in position on the tube by contact "with a loose` metal lug 11 which lug conforms to the periphery of the tube and has longitudinal extensions 12 in the direction of the axis of the tube. When the metal lug is placed in proper position on the upper side of the tube and the two tiles are assembled with and supported by it, all are maintained in position for service as shown in Fig. 4. In removing it is necessary to take both tiles of a pair od at the saine time and this can be readily done by grasping the tiles .and separating the lower edges, a clearance between the upper edges of the tiles permitting them to move toward each other a sufficient distance to be lifted free of the tube.

I lower face 14 struck on an are, the

In Fig. 5 we have shown the form of tile used for the batlie 2. These tiles 13 have a l center of which is in a vertical line a passing through the center of t-he corresponding tube, the center being such that the intersection of the arcs of two adjacent tiles will be above the horizontal center line b of the tubes. A Above the point of intersection of the two arcs 14 the abutting faces are in a vvertical plane. This position of the center gives such a form to the tile that when it is rotated upwardly about the tube center the tile will immediately free itself from the adjacent tile and so permit ofits rotation through a suicient arc to remove it from its place without disturbing any tiles of Fig. 5, when supported on the tubes 8, break joint as shown in Fig. 4 so that the removal of one tile does not permit its com-.

panion tile to fall. A clearance is provided 'by cutting away the upper edge of the t-ile at 1G to permit of the rotation of the tile a suicient distance to effect its removal.

V'Ihe inclosing tile used on the lower row of the bank of inclined water tubes to form the bathe 4 is of a form commonly used and is shown in Fig. 2. When it is required to replace one of the tiles of this bathe it is necessary to slide the tile endwise from an open space and it will be readily -understood that the form shown in Fig. 5, because of the facility with which it may be put in place or removed without disturbing the adjacent tiles, offers distinct advantages.

From the foregoing description it will be seen that thebaille 2 constituting the roof of other portion of the roof. These above and to a polnt 'wa-ll, tubes embedded in the furnace consists of abutting tiles and is continuous in both directions from the front wall vto a point beyond the bridge wall. From that point to the rearwall or header, the openings between the tubes permit. the passage of the gases from the passage or combustion chamber Y to the passage r That is, by spacing the tubes 8 farther apart than heretofore we are enabled to construct the baffle 2 with-supporting water tubes exi tending from the front to the rear of the boiler and to embed such tubes for their full length, so that the gases are completely protected from the cooling effect of the heating surface throughout their passage from the furnace tothe first pass A..

What we claim and desire to secure by Letters Patent of the United States is :f

1. In a water tube boiler, in combination, a bank of inclined ywater tubes, a-plurality of transverse baffles dividing said bank into transverse passes beginning at the steam uptake end, a furnace and a bridge wall therefor, a battle extending from the front wall beyond the bridge wall, a row of tubes embedded in said battle and extending from the front to the rear of the boiler, a fire brick covering for said tubes beyond the baie, and a passage above said bafile communicating with a combustion chamber and leading to end.

2. In a water tube boiler, in combination,

a bank of inclined water tubes, transverse battles dividing said bank into a plurality of passes beginning at the steam uptake end, a furnace and a bridge wall therefor, a combustion chamber at the rea'r of said bridge wall, a battle 2 forming a roof for said furnace extendingv beyond the bridge wall, tubes embedded in said baiile and extending from the front to the rear of the 5 the steam uptake 9 boiler, and connected to the boiler circulai tion, a fire brick coverlng for the ends of the tubes beyond the baille, said bricks being of less width than the space'between the tubes so as to provide clear openings from said combustion chamber, and a passage above said bae leading to the steam uptake end. A

3. In a water tube boiler, in'combination,

- a bank of inclined water tubes, transverse baiiles dividing said bank Ainto a plurality of passes beginning at the steam uptake end,

'a .furnace and a bridge wall' therefor, a combustion chamber at the rear of said bridge wall, abaie 2 forming a continuous roof for said furnace extending beyond the bridge said bale and extending from the front to the rear o'f the boiler, a tire of the tubes extending beyond the baie, said bricks being of such width as to form clear openings between them, and a baiile extending forwardly from the rearl to the brick covering for the portions esami first pass and forming with said first-named baille a passage which communicates withV said combustion chamber.

4. In a'water tube boiler, a bank of' inclined water tubes, transverse bandes dividing said bank into a plurality of passes beginning at the steam uptake'end, a

v wall, tubes embedded tending from the front to the l-rearoi the boiler, a fire brick covering for the portions of the tubes extending beyond theY balie,

in combination,`

` vof tubes of 'said bank and 1n said baille' and exsind bricks Being of Sach width as to form clearA openings tween them, and abeille extending forwardly from the rear to' the first pass and supported on the lower row vforming` with said rst-named Abaille a passage which communicat'es with said combustion chamber.

In testimony whereof we have hereunto signed our'names in the presence of two subscribing Witnesses.

MINUTT W. SEWALL. DAVID S. JACOBUS. Witnesses:

MARY WINTER, EDITH CAMP. 

